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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Transportation and Traffic Mitigation Measure TR-4: Reconstruct Segments of Koster Road and Blewett Road The improvements below are those needed not only to mitigate the _ Project's impacts but also to correct existing and year 2007 baseline roadway deficiencies. The project proponent will be required to contribute a fair share towards the implementation of the following improvements prior to operation of the proposed Project. According to the County of San Joaquin Department of Public Works Improvement Standards,a roadway's structural pavement design is calculated based on the TI value and the resistance value of basement soil(R-Value). Drawing No. R-27 in the Improvement Standards provides a formula for calculating the total Gravel Equivalent(GE),which forms the basis for developing the required roadway structural section,based on the TI and — R-Value. The roadway improvement drawings prepared for the previous Bird Road improvements showed an R-Value of 26,which is also used in calculating the GE for this and other impacts. _ ■ Reconstruct Koster Road from the Project's entrance south to Blewett Road to provide a 32-foot paved roadway surface with 50 _ feet of right of way according to the County's typical rural road sections. The County's"Road Inventory"indicates that Koster Road is built on six-inches of base material that has been sealed over the _ years. Though the actual structural section is unknown at this time the existing structural section should be based,as a minimum, on a TI value of 9.0. TI values of 9.0 were also calculated for year 2007 base conditions and year 2007 plus project conditions. — Following are the calculated total GE's on Koster Road for existing conditions,year 2007 baseline conditions,and year 2007 plus project conditions. Existing Conditions(TI=9.0,R=26): GE=2.13 Year 2007 baseline conditions(TI=9.0,R=26): GE=2.13 Year 2007 plus project conditions (TI=9.0,R=26): GE=2.13 _ ■ Reconstruct Blewett Road segments that are less than the County's rural road standard between Koster Road and Bird Road to provide a — 32-foot paved roadway surface with 50 feet of right of way according to the County's typical rural road sections. The County's "Road Inventory"indicates that Blewett Road is built on six-inches of base material that has been sealed over the years. Though the actual structural section is unknown at this time the existing structural section should be based, as a minimum,on a TI value of 9.0. A TI value of 9.5 was calculated for year 2007 base conditions and a TI value of 10.0 was calculated for year 2007 plus project conditions. DeSilva Gates Quarry Project — Draft Environmental Impact Report 3.L-40 J&s 05105.05